The 2020–21 season was the 115th season in existence of Sporting Clube de Portugal and the club's 87th consecutive season in the top flight of Portuguese football. In addition to the domestic league, Sporting CP participated in this season's editions of the Taça de Portugal and the UEFA Europa League. The club also qualified for the Taça da Liga, depending on the league results. The season covered the period from 26 July 2020 to 30 June 2021.
Sporting won the 2020–21 Primeira Liga with two matches remaining, following a 1–0 home win against Boavista, and thus became Portuguese champions for the 19th time in their history, and for the first time since the 2001–02 season. In this season, Sporting set a league record for the longest unbeaten run in a single season with 32 matches in a row (25 wins and seven draws) out of 34 matches.
Source: Liga Portugal Rules for classification: 1) Points; 2) Head-to-head points; 3) Head-to-head goal difference; 4) Head-to-head away goals scored; 5) Goal difference; 6) Matches won; 7) Goals scored; 8) Play-off. (C) Champions Notes:
^ abBraga qualified for the Europa League group stage by winning the 2020–21 Taça de Portugal. Since they would have qualified for the Europa Conference League third qualifying round by finishing fourth, the berth was awarded to the fifth-placed team (Paços de Ferreira), and the Europa Conference League second qualifying round berth reserved to the fifth-placed team was awarded to the sixth-placed team (Santa Clara).